Interfacing AD7768 adc to Zed board

1)As i am trying to interface the AD7768EVAL board through FMC to Zed board, when i am trying to read the value of a specific register through SPI lines always i am getting zeros in return. I am using Xilinx ISE 14.7, SPI initialization, read and writes are done in SDK according to the format mentioned in datasheet(R/W,7 address bits, 8 data bits).

2)After powering the AD7768EVAL and Zed board, when i am trying to observe the DCLK, DOUT(0 to 7) in chipscope always they are zeros.( I verified the pin constrains used in the design with respect to schematics of AD7768eval and Zed they are perfect)